New physics in flat Moire bands

          @misc{ scivideos_PIRSA:20110000,
            doi = {10.48660/20110000},
            url = {https://pirsa.org/20110000},
            author = {Berg, Erez},
            keywords = {Quantum Matter},
            language = {en},
            title = {New physics in flat Moire bands},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2020},
            month = {nov},
            note = {PIRSA:20110000 see, \url{https://scivideos.org/pirsa/20110000}}
          }
          

Abstract

Flat bands in Moire superlattices are emerging as a fascinating new playground for correlated electron physics. I will present the results of several studies inspired by these developments. First, I will address the question of whether superconductivity is possible even in the limit of a perfectly flat band. Then, I will discuss transport properties of a spin-polarized superconductor in the limit of zero spin-orbit coupling, where the topological structure of the order parameter space allows for a new dissipation mechanism not known from conventional superconductors. If time allows, I will also discuss the interpretation of new measurements of the electronic compressibility in twisted bilayer graphene, indicating a cascade of symmetry-breaking transitions as a function of the density of carriers in the system. 

 

References:

https://arxiv.org/abs/2006.10073

https://arxiv.org/abs/1912.08848

https://arxiv.org/abs/1912.06150